About the ROI Calculator
Return on Investment (ROI) is the most widely used measure of whether something was worth the money — a stock, a property, a marketing campaign, a course, a piece of equipment. It expresses your net gain as a percentage of what you put in, giving a single, comparable number. This calculator takes the initial cost and the final value and returns both the net gain and the ROI percentage instantly.
The ROI formula
ROI = ((Final value − Initial cost) ÷ Initial cost) × 100
Suppose you invest ₹1,00,000 and it grows to ₹1,50,000. Your net gain is ₹50,000, and your ROI is (50,000 ÷ 1,00,000) × 100 = 50%. If instead it fell to ₹80,000, the gain is −₹20,000 and the ROI is −20% — a loss. The percentage form is what makes ROI so useful: it lets you compare a small investment and a large one on the same scale.
Why raw ROI can mislead: the role of time
ROI on its own says nothing about how long it took, and time changes everything. A 50% return is spectacular in a year and unremarkable over twenty. To compare investments held for different periods, convert to an annualized ROI:
Annualized ROI = ((Final ÷ Initial)(1 ÷ years) − 1) × 100
That same 50% total return earned over three years is only about 14.5% per year. Always pair an ROI figure with its time horizon, or annualize it, before drawing conclusions.
What ROI does not tell you
ROI is powerful precisely because it is simple, but that simplicity hides three things. First, it ignores risk: a 30% ROI from a volatile bet is not equivalent to 30% from a safe one, because you might just as easily have lost money. Second, it ignores time unless you annualize. Third, the basic formula ignores fees, taxes and inflation — a 10% nominal return during 6% inflation is only about 4% in real spending power. For honest comparisons, fold costs and taxes into your figures and think in real terms over the long run.
ROI versus other measures
ROI is often confused with related metrics. Profit margin compares profit to revenue (what share of sales is profit), not to the amount invested, so it answers a different question — see the Profit Margin Calculator. For investments that involve regular contributions rather than a single outlay, a future-value approach like the SIP Calculator is more appropriate. ROI is best for a clean before-and-after on a defined sum.
Using the calculator
Enter what you invested and what you ended with to see the gain and the percentage return. For a fair comparison between options, make sure each uses the same definition of cost and return (ideally net of fees and tax) and the same time basis. The calculation runs privately in your browser.
Frequently Asked Questions
How is ROI calculated?
ROI = ((final value − initial cost) ÷ initial cost) × 100. It expresses your net gain as a percentage of what you put in. Investing ₹1,00,000 and ending with ₹1,50,000 is a ₹50,000 gain, or a 50% ROI.
What is a “good” ROI?
It depends entirely on the investment, the risk and the time taken. A 50% ROI over twenty years is modest; the same 50% in one year is excellent. Always compare ROI against the time period and the risk involved, and against safe alternatives like deposits.
Why should I annualize ROI?
Because a raw ROI ignores time. A 50% return over three years is about 14.5% per year, while 50% in one year is 50% per year — very different. Annualized ROI = ((final ÷ initial)^(1 ÷ years) − 1) × 100 lets you compare investments of different lengths fairly.
Does ROI account for risk?
No. ROI measures only the return, not the chance of loss. A high ROI from a risky bet is not directly comparable to a lower ROI from a safe one. Judge ROI alongside the risk you took to earn it.
Can ROI be negative?
Yes. If the final value is less than what you invested, the gain is negative and so is the ROI — a loss. For example, ₹1,00,000 falling to ₹80,000 is a −20% ROI.
Does this include fees, taxes and inflation?
No. The basic ROI uses the cost and final value you enter. For a true picture, include fees and taxes in the cost and proceeds, and remember that inflation erodes the real value of any nominal gain.
How is ROI different from profit margin?
ROI compares gain to the amount invested, answering “what return did my money earn?”. Profit margin compares profit to revenue, answering “what fraction of sales is profit?”. They measure different things — see the Profit Margin Calculator for the latter.